US 12,084,732 B2 · Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom

Abstract

A hypereutectic chromium white iron alloy which comprises, in weight percent based on the total weight of the alloy, from 1.5 to 2.85 carbon, from 0.01 to 1.2 nitrogen, from 0.1 to 1.4 boron, from 3 to 34 chromium, from 0.1 to 7.5 Ni, and from 0.1 to 4 Si. The alloy may optionally comprise one or more additional elements, i.e., manganese, cobalt, copper, molybdenum, tungsten, vanadium, niobium, titanium, zirconium, magnesium and/or calcium, one or more rare earth elements, and one or more of tantalum, hafnium, aluminum. The remainder of the alloy is constituted by iron and unavoidable (incidential) impurities. Articles cast from the alloy, especially cryogenically hardened articles, are also disclosed.

Claims19

Dependent claims

A hypereutectic white iron alloy, wherein the alloy consists of, in weight percent based on a total weight of the alloy:

C
from 1.5 to 2.85
B
from 0.6 to 1.4
N
from 0.01 to 1.2
Cr
from 5 to 34
Ni
from 0.2 to 7.5
Si
from 0.1 to 4
Mn
from 0 to 8
Co
from 0 to 5
Cu
from 0 to 5
Mo
from 0 to 5
W
from 0 to 6
V
from 0 to 12
Nb
from 0 to 6
Ti
from 0 to 5
Zr
from 0 to 2
(Mg + Ca)
from 0 to 0.2
one or more rare earth elements
from 0 to 3
one or more of Ta, Hf, Al
from 0 to 3,
remainder Fe and incidental impurities,
and wherein a Brinell hardness (HB) of an article sand-cast from the alloy is at least 600.

35 more elements

Dependencies are inferred from the claim text.

Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom

Life of this patent

Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom

Life of this patent

Abstract

Claims19